Alloy.



' the following proportions ,able qualities aluminium are known,

1 to 2% of tin.

JOHN FREDERICK DUKE, 0F MANCHESTER, ENGLAND.

ALLOY.

No Drawing.

Specification of Letters Patent. Application filed May 15, 1911.

Patented Nov. t9, 119112. Serial no. 627,249.

To all whom it may concern:

Be it known that I, JOHN FREDERICK DUKE, of Hazel Bank, Kersal, Manchester, England, metallurgist, have invented certain new and useful Improvements in and Relating to Alloys, of which the following is a specification.

This invention relates to alloys and has for its object to provide an alloy having the I merits and advantages'of nickel silver and similar alloys without the many objectiondue to their zinc content. arious alloys of copper, nickel, iron and but in no case are the proportions herein specified employed.

Alloys containing 2. iron are known, but such alloys were found to increase gradually in hardness and difliculty of working as the iron content was increased, I have now discovered by experiments that an increased iron content about 25% gradually softens the alloy again until at 50% of iron the maximum of ductility is reached and the finest color is obtained, provided the nickel content in the alloy is in creased proportionately to the iron content.

Une alloy, remarkable for its cheapness, beautiful silver white color, splendid polish, softness, malleability, ductility and resistance to vegetable acids and oxidation (especially when its large iron content, over 50%, is considered) is composed of the metals in Vols. ("Parts weight are added during the melting and a residuum of this ing from 1 to 2% parts by weight is left in the alloy, about 1} part by weight being lost with each re-melting.

Where hardness of the alloy is not objectionable or is advantageous I may add from process of metal varynot of the deslred color.

' stitute magnesium high percentage of A I do not bind myself to the exact proportions here enumerated but I keep the iron content between and 52% by weight. By reducing the nickel and iron content below the content given in the example an alloy can be obtained which is harder but more liable to become tarnished and oxidized and The aluminium content may also be slightly varied, an increase in aluminium producing a harder and a decrease a softer alloy. I may also submanganese, phosphorus, sodium potassium, or any other suitable deoxidizing agent in place of or as an auxiliary to the aluminium.

WhatI claim and desire to secure by Let ters Patent is z- 1. An alloy of iron, copper, nickel and a metallic deoxidizing agent content varying between 40 and 52 per cent. by weight, and a residual portion of about 4; to 1%} per cent. by weight of the metallic deoxidizing agent.

2. An alloy by weight of the aluminium.

3. An alloy of iron, copper, nickel and a metallic deoxidizing agent, having an iron content between 40 and 52 per cent, a nickel content amounting to about one-third by weight of the iron, and a residual portion of about ,1 to 1% per cent. by weight of the metallic deoxidizing agent.

4. An alloy composed of iron, copper,

nickel and residual aluminium in about the.

following parts by weight :-iron 92, copper 53, nickel 35, aluminium 1 to 21.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOHN FREDERICK DUKE.

Witnesses: I

THOMAS THORP, JNo. WM. GRnAvEs. 

